【多图】【严肃的技术帖】用UE4做黑丝材质

https://zhuanlan.zhihu.com/p/32064456

【多图】【严肃的技术帖】用UE4做黑丝材质

奶帆

0.序言

近日，回答了一篇关于绝地求生大逃杀优化为何如此渣的问题，为了说明性能都被什么东西啃掉了，特别拿丝袜举了个例子，广大网友纷纷私信，想要了解更多。所以有了这篇文章。本文希望给大家的启发，是如何观察身边的各种材质，从了解材质的物理性质，到UE4里利用材质系统模拟出质感。

丝袜，常出没于春秋之季。是各位小姐姐治疗静脉曲张、展示腿型的必备法宝。此处对于静脉曲张的防范和治疗不做过多的解释。我们主要研究研究丝袜的视觉效果以及如何在UE4中实现丝袜材质。

本文是以严肃认真的态度去讨论UE4的材质制作。大家一定要怀着学术的心态阅读本文，请各位司机谨慎驾驶。

1.丝袜为何会如此性感

不得不说，一双美腿配丝袜，确实会将性感的级别拉高好几个Level。但是为什么呢？

我们以下面这位小姐姐照片为例，来进行简单的分析与探讨（照片都来自网络，侵删）

穿着丝袜的女士照片

让我们放大一下丝袜部分

放大局部的穿着丝袜的女士照片

是什么让我们从视觉上觉得丝袜会更好看呢？答案就在上面这张图上，请注意看丝袜部分和非丝袜部分的区别，丝袜在接近边缘的位置会有明显的变暗，而非丝袜部分边缘则没有明显的暗区。

丝袜边缘颜色

丝袜中心颜色

非丝袜部分边缘颜色

非丝袜部分中心颜色

由此可见，穿上丝袜后，会有明显的边缘变暗的效果。

这张效果更明显

那么为什么边缘变暗会让我们觉得更加性感呢。

其实我们人辨认物体是通过物体的边缘轮廓去识别物体的，这点被用在了卷积神经网络视觉识别上。也就是说，我们天生对物体的边缘会有敏感性，当我们看到明显对比度的线条时，其所勾勒的形状就会深深的印在你的脑海里。

丝袜通过其边缘的明显的变化区，让你无论是不是足控，都会一眼注意到穿着者的腿部轮廓和线条。

与之相反的那就是迷彩服了，迷彩服通过弱化形象轮廓，从而达到迷惑敌人的目的（说的就是你，那个趴在地上穿着吉利服的人）

敌人在哪里？我在哪里？谁在打我？

3.为什么丝袜会有这种特性？

为了给你们说明这个问题，我特意去搞了条丝袜，和一个显微镜。

我们先通过显微镜看一下丝袜的微观结构

丝袜的微观结构

可以看到，丝袜上有很多细小的空隙，而编织丝袜的材料特别有弹性，于是乎，丝袜穿上腿过后，这些孔会被拉伸，像这样

被拉伸的丝袜局部

这样的结构使得丝袜在不同的观察角度，，丝袜纤维对于光线的遮挡会发生变化

丝袜底部透出光线随角度的变换

上图我们可以看出来，越接近90度垂直视角，从丝袜底部透出的光线就越多，而越接近180度的视角，则丝袜本身的颜色就会越来越明显，直到趋近于完全展示丝袜的效果。听起来是不是很熟悉？对，这就跟水面的折射原理类似。

4.如何在引擎里实现丝袜

我们已经知道了丝袜的结构和特性，那么下一步就是要怎么在引擎里实现对应的效果。首先要请出我们今天的核心节点：Fresnel节点，也就是传说中的菲涅尔节点。因为由前面的分析得知，丝袜的效果是法线与视觉方向的夹角越接近90度，则丝袜本身的颜色就越明显，而夹角越接近0，丝袜内部的颜色就越明显。

我们看一下菲涅尔函数的效果预览

菲涅尔效果预览

从图中可以看到，越是接近球的边缘，颜色越亮，也就是越接近1。恩，，，图中已经有了白丝的感觉了不是么。

那么我们只需要合理利用这个输出结果进行搭配，就可以生成丝袜的基本效果了。

思路是，利用菲涅尔节点的计算结果，进行简单的变换后，作为Alpha，将底色（肉）和丝袜的颜色进行Lerp。

首先菲涅尔的默认效果还是不太好，因为边缘和中间的差距太大，我们通过降低ExponetIn的参数值进行调整

基本完成后节点

扔到场景后的效果，是不是有点丝袜的神韵了？

这里解释一下为什么要用那么多参数。因为丝袜有分很多种颜色，也有不同的透光度，所以这里留下各种参数，方便大家创建材质实例的时候直接调整就好。

5.能再给力点么

要把上面那坨东西看成丝袜，还是需要点想象力的。那么我们要添加更多的细节进去。

比如这里丝袜的一些星星点点的高光，我们就用Noise节点来实现

像这样，然后再通过乘法削弱其亮度，再叠加到边缘位置，越靠近边缘强度越大，这里就另外用一个菲涅尔节点来表示

同时我们也发现，丝袜并不是一个完全透明的，所以我们前面基础颜色Lerp之前再加上一些噪音，使得中间部分不那么亮

改造后的BaseColor和丝袜混合的Aplha计算

添加BaseColor噪声和高光噪声后

到这里，丝袜效果的核心就已经制作完成了，接下来就是创建材质实例，调节出你自己想要的效果了。

白丝

红丝

6.后记

整个材质的制作过程是从分析到原理再到引擎实现，当然，所做的丝袜并不算很漂亮很完美的效果，笔者也承认自己在美术方面的造诣并不深，但希望使用此文能够给大家一些制作材质的灵感和思路。

最后，把整个材质里的节点复制在下面，理论上大家粘贴到UE4材质编辑器中就可以使用了

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发布于 2017-12-16

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113 条评论

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精选评论（1）

Milo Yip1 年前

我觉得皮肤和丝袜本身的反射应该分开计算（丝袜的 specular 和皮肤不同），然后按一个 f(N dot L) 的函数来做混合，但那个函数我觉得和 Fresnel 没直接关系，是各种丝袜编织的遮挡结构做成的。

知乎用户1 年前

一本正经的搞(kan)学(si)习(wa)
（可以来个Unity版本的不?

奶帆 (作者) 回复知乎用户1 年前

没用过Unity哦，原理是差不多的，实在没有实现的方式，也可以用点积来做，只是处理稍微麻烦点

知乎用户回复奶帆 (作者) 1 年前

嗯，哪天有兴趣了试试，谢谢用心的分享

饭粒1 年前

再多些一些关于UE4得吧，福利下学习的人，哈哈
我自己1 年前

赞一个，虽然更喜欢光腿
樊冬宇1 年前

。。话说手机的皮肤材质你搞出来好的了么？
黄得课1 年前

突出五个脚趾的“脚套”不能忍=_=脚趾处应该再加一层模型的

奶帆 (作者) 回复黄得课1 年前

啊啊啊，我随手拿的一个人物模型处理的，，，穿上鞋就看不到啦。。。

美国队长的小号回复奶帆 (作者) 1 年前

您好，那肉色丝袜为什么也会看着很性感？

做游戏的老G1 年前

包教包会，附赠代码，良心作者
Milo Yip1 年前

我觉得皮肤和丝袜本身的反射应该分开计算（丝袜的 specular 和皮肤不同），然后按一个 f(N dot L) 的函数来做混合，但那个函数我觉得和 Fresnel 没直接关系，是各种丝袜编织的遮挡结构做成的。

奶帆 (作者) 回复Milo Yip1 年前

嗯，今天在做的过程中也发现了这个问题，所以正在尝试用dot来计算混合值。用Fresnel做丝袜其实有点投机了，并没有按照其本身的物理特性来。感谢大神指点。

年迈的老秋风1 年前

这个思路...牛...牛逼
巫布斯1 年前

丝袜都独立个材质这么细！！！！！！！！牛逼！
胡泽萍1 年前

为什么这个明明是个教程，却让我……

奶帆 (作者) 回复胡泽萍1 年前

心中泛起波澜？

胡泽萍回复奶帆 (作者) 1 年前

让我……想……好好学习！

赵五道1 年前

爱学习的老司机
知乎用户1 年前

严肃，严肃
godlike1 年前

过多解释一下静脉曲张的防范和治疗吧?

奶帆 (作者) 回复godlike1 年前

静脉曲张主要是静脉瓣膜出问题引起的，静脉瓣膜主要是为了防止静脉血液倒流(主要在四肢上，因为静脉血压较低，所以有这样的结构确保血液能够从脚趾头溜回心脏)，一旦出问题，就容易造成局部血管的膨大。静脉曲张主要发生在长期站立的人的人身上，预防方式主要是穿一种叫防静脉曲张袜的东西，这玩意类似丝袜，但不同之处在于其压力分布不同，基本上是越靠下越紧。治疗的话，还是去医院挂号吧，别信我这个修电脑的。/滑稽

打钱买菜1 年前

咳咳，都严肃点
一提大可乐1 年前

严肃认真关注了?
米奇是只狗1 年前

丝袜不是为了保暖么？
猜猜我是谁1 年前

老铁神操作简直爆炸
cruizer1 年前

能不能再加一个根据曲面曲率降低或加深透明度的功能
bigFeline1 年前

这根本不是到幼儿园的车(._.`)